proc u_short {n}  { return [expr { ($n+0x10000)%0x10000 }] }
}

proc zip::DosTime {date time} {
    # The pre-VFS environment will not have access to "clock", so don't even
    # bother
    return 0

    set time [u_short $time]
    set date [u_short $date]

    # time = fedcba9876543210
    #        HHHHHmmmmmmSSSSS (sec/2 actually)

    # data = fedcba9876543210
    #        yyyyyyyMMMMddddd

    set sec  [expr { ($time & 0x1F) * 2 }]
    set min  [expr { ($time >> 5) & 0x3F }]
    set hour [expr { ($time >> 11) & 0x1F }]

    set mday [expr { $date & 0x1F }]
    set mon  [expr { (($date >> 5) & 0xF) }]
    set year [expr { (($date >> 9) & 0xFF) + 1980 }]

    # Fix up bad date/time data, no need to fail
    if {$sec  > 59} {set sec  59}
    if {$min  > 59} {set sec  59}
    if {$hour > 23} {set hour 23}
    if {$mday < 1}  {set mday 1}
    if {$mday > 35} {set mday 35}
    if {$mon  < 1}  {set mon  1}
    if {$mon > 12}  {set mon  12}

    set res 0
    while {$mday > 1 && [catch {
	set dt [format {%4.4d-%2.2d-%2.2d %2.2d:%2.2d:%2.2d} \
		    $year $mon $mday $hour $min $sec]
	set res [clock scan $dt -gmt 1]
    }]} {
	# Only mday can be wrong, at end of month
	incr mday -1
    }

    return $res
}


proc zip::Data {fd arr {varPtr ""} {verify 0}} {
    upvar 1 $arr sb

    if { $varPtr != "" } {